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I have a MacBook (OS X, 10.4.11) and the trackpad button just stopped working last week. I've rebooted multiple times (with and without the battery) but nothing. I attached a mouse and I can right click...but the left button does nothing. However I can click 'some' things by clicking the scroll button on the mouse. For instance, I can click the system preferences button using the scroll. I can click on one of the options (ex. Keyboard & Mouse) using the scroll button but when the Keyboard & Mouse window pops up I can't click anything in the window. The trackpad is not set up to click unfortunately. I also could scroll click to pull up the 'About this Mac' info but now I can't close the window. Any ideas what I can do?

Uhm... somehow remove the mouse preferences file. I guess it wouldn't be that hard. If you can navigate to Home > Library > Preferences, you can use the arrows on the keyboard to highlight something like com.apple.mouse.plist (I think.) Then use Command+Delete to send it to the Trash.

Ok I checked on Apple forums and found someone else with the same problem. They noticed that if they used a mouse *without* touching the trackpad that the mouse would work fine. I restarted my macbook and only used the mouse and could click with no problem. But (like the other person) the moment I touched the trackpad the mouse would have the same problem not clicking again. I restarted again and clicked 'ignore trackpad when mouse is attached'. Unfortunately there was no resolution on the other forum for the trackpad--I'll have to use the mouse for now.

I had a problem where my track pad button stopped working. I took it to Genius bar and they actually were geniuses. The battery in the macbook pro had expanded substantially and pressed on the rest of the case such that the track pad no longer clicked. The battery was replaced for free even though it was 4 years old and the trackpad clicks now perfectly and I have a new battery.